Duplex pump.



PATENTED AUG. 16, 1904.

D. P. LBPLEY. DUPLEX PUMP. APPLICATION FILED B EPTP4, 1903.

2 SHEBTSSHEET 1.

N0 MODEL.

I No. 767,579. PATENTED AUG.16,1904.

1). 1". LEPLEY.- DUPLEX PUME,

APPLIOATIQN FILED SEPT. 4, 1903. no 110mm.

2 SHEETS-SHEET 2 I I i 'W fzsscs UNITED STATES Patented August 16, 1904.

DANIEL F. LEPLEY, CONNELLSVILLE, PENNSYLVANIA.

DUPLEX PUMP- SPECIFICATION forming part of Letters Patent No. 767,579, dated August 16, 1904.

Application filed September 4, 1903. Serial No. 171,992. (No model.)

T0 at whom it may concern.-

Be it known that I, DANIEL F. LEPLEY,a citizen of the United States, residing at Connellsville, in the county of Fayette and State of Pennsylvania, have invented a new and useful Duplex Pump, of which the following is a specification.

This invention relates to certain improvements in pumps, and especially to compressedair mine-pumps used in following entries and movable to follow the work of the miners.

The principal object of the invention is to provide a plunger-pump having packing so arranged as to permit ready renewal without the necessity of removing any of the parts of the pump and which, together with its glands, may be readily removed when worn.

With this and other objects in view, as will more fully hereinafter appear, the invention consists in the novel construction and arrange.- ment of parts hereinafter describechillustrated in the accompanying drawings, and particularly pointed. out in the appended claims, it being understood that various changes in the form, proportions, and minor details of construction may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a longitudinal sectional elevation of the water end of a duplex mine-pump construced in accordance with the invention. Fig. 2 is a transverse sectional elevation of the same on the line 2 2 of Fig. 1. Fig. 3 is a detail perspective view of a bushing-ring employed in part to hold the packing in position. Fig. 4: is a similar view of the gland through which pressure may be exerted on the packing.

Similar numerals of reference are employed to indicate corresponding parts, throughout the several figures of the drawings.

In light-weight or dip pumps used in mining service for following deep entries or, in other words, following entries which incline downward and where it is necessary to remove the corrosively-impregnated water as the miners progress piston-pumps or outsidepacked pumps have been found impracticable, owing to the cutting, rolling, and other destruction of the packing, and plunger- 'within the cylinder is a plunger 4, to which motion is transmitted from the air or steam end by means of a piston-rod 5. The cylinder is divided into two portions 6 and 7 having bores of different diameter, by means of an inwardly-projecting annular flange 8, arranged at a point about midway of thelength of the cylinder. This flange serves as a support for a bushing-ring 9, preferably formed of bronze in order to prevent corrosion, and forms the end wall of a packing chamber 10, in which may be placed ordinary tallowed hemp packing. The opposite end of the packing-chamber is formed by a gland 11, having at one end an annular flange 12, held in place by the removable head 13 of the cylinder. The end of the cylinder and its head are both slightly countersunk for the'reception of the flange 12, and said flange is firmly secured in place by the cylinder-head bolts 14, adjustment of these bolts serving also to move the gland inward and compress the packing in the chamber 10. The main body of the gland is in the form of a ring 15, of such thickness as to fit snugly in the annular space between the periphery of the plunger 4 and the wall of the bore 7 and said ring is connected to the flange 12 by a plurality of arms 16,between which are formed spaces to permit the free passage of water from theend of the cylinder through the port 2.

To prevent interference with the movement of the water,the arms are reduced in thickness, and the back portion of the cylinder-bore, in which they are disposed, is of greater diameter than the bore which forms the packing-chamber. The ring 11 will prevent displacement or vibration of the plunger, and when forced by the cylinder-head bolts or nuts in the direction of the bushing 9 will cause the compression of the packing, and such compression may be carried on to any desired extent in accordance with the character of the work on which the pump is used.

One of the principal advantages of the structure resides in the fact that by the removal of the cylinder-head it is possible to withdraw the plunger after loosening the bronze nuts 16, which hold it to the plunger-operating rod, and insert a substitute plunger, thereby interrupting the operation of'the pump for only a short time.

A further advantage resides in the fact that the plunger has an extended bearing-surface within the cylinder without, however, coming into contact with that portion of the surface of the cylinder over which the liquid passes,

so that a cheap tallowed hemp packing may be employed, where in piston-pumps it becomes necessary to employ an expensive vulcanized-rubber packing.

A further advantage resides in the arrangement of the enlarged or extended head 13, by removing which the gland and the packing are in convenient position comparatively close to the end of the cylinder, thus allowing more convenient renewal of the packing than when it is disposed at an approximately central point.

'While in the specification reference has been made more especially to duplex pumps, it is to be understood that the pumps may be built either in single or duplex.

A pump constructed in accordance with the invention is light enough to permit ready handling when it becomes necessary to shift its position, is simple and compacted, and may be maintained at a very little cost.

Having thus described the invention, what is claimed is- 1. In a plunger-pump, a removable cylinder-head, chambered to form a portion of the cylinder into which the plunger may enter at each stroke, the cylinder having an inwardlyextending annular flange, a bushing of smaller internal diameter than the flange and extending over the inner face thereof, said bushing forming one end of a packing-chamber, a

gland having a ring portion of an internal diameter equal to that of the bushing and forming with said bushing a friction-surface of reduced area for contact with the plunger, said ring portion of the gland also forming one end of a packing-chamber, the outer end of said gland having an outwardly-extending flange confined in place and centered between the end of the cylinder and the removable chambered head.

2. In a pump, the combination with a cylinder having an inwardly-extending annular flange, a removable bushing seated on the inner face and one side of the flange and forming one end of a packing-chamber, a gland forming the opposite end of said packingchamber, said gland having at one end a projecting flange, and a detachable chambered cylinder-head having a countersunk portion for the reception of the projecting flange and serving to hold the gland from both longitudinal and transverse play.

3. In a plunger-pump, the combination with a cylinder having an inwardly extending flange of less diameter than the bore of the cylinder, a bushing angular in cross-section and seated on the inner face and one wall of the flange, said bushing forming one end of the packing-chamber, a gland including a ring forming the opposite end of the pack ing-chamber, said gland having at its outer end a projecting flange and the flange and ring being united by spaced arms less in thickness than the ring, and a detachable chambered head secured to the end of the cylinder, the end of the cylinder and the adjacent portion of the head being countersunk to form a pocket for the reception of the flange of the gland and serving to hold said gland from longitudinal and transverse play.

In testimony that I claim the foregoing as my own I have hereto afflxed my signature in the presence of two witnesses.

DANIEL F. LEPLEY WVitnesses:

WILLIAM H. SoIssoN, JAs. B. RUTH. 

